Implement k8s count handler (#97955)

* Implement k8s count handler

* Fix endpoint

* Fix type converstions

* Add tests for foldercounts

* Add more tests

* Only use sql-fallback if no values in unistore

* Update gomod

* Fix test

* Update pkg/api/folder_test.go

Co-authored-by: Bruno Abrantes <bruno.abrantes@grafana.com>

* Go.mod

---------

Co-authored-by: Bruno Abrantes <bruno.abrantes@grafana.com>

pkg/apis/folder/v0alpha1/types.go

@@ -2,6 +2,8 @@ package v0alpha1
 
 import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime"
 )
 
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
@@ -76,3 +78,9 @@ type ResourceStats struct {
 	Resource string `json:"resource"`
 	Count    int64  `json:"count"`
 }
+
+func UnstructuredToDescendantCounts(obj *unstructured.Unstructured) (*DescendantCounts, error) {
+	var res DescendantCounts
+	err := runtime.DefaultUnstructuredConverter.FromUnstructured(obj.Object, &res)
+	return &res, err
+}